Encoding device and dynamic image recording system using the encoding device

Abstract

To encode a moving picture in real time in as high quality as possible, no matter whether a target bit rate for encoding the moving picture is high or low. An encoder performs motion compensated inter-picture predictive coding on moving picture data in a selected one of prediction modes. The encoder includes: a detecting section for detecting an accumulated error and a motion vector of a block, included in a picture to be encoded, by reference to a block in a reference picture to be used for each prediction mode; an estimating section for calculating an estimated value by adding a product of each accumulated error and a predetermined first coefficient and that of a predicted vector associated with each motion vector and a second coefficient; a determining section for selecting one of the prediction modes according to the estimated value; a coefficient updating section for updating a proportionality factor using at least a quantization scale used when the block to be encoded is quantized; and an encoding section for encoding the data of the block to be encoded in the prediction mode selected.

Description

technical field [0001] The invention relates to a compression coding technique for compressing and coding moving image image data with high efficiency. Background technique [0002] In recent years, along with the development of multimedia applications, it is generally possible to digitize all media information (eg, images, sounds, and texts) for unified processing. Among them, for example, since the data volume of digital data (image data) of images, especially moving images is very large, a compression technique for efficiently compressing moving image data is required for storage and transmission. As a compression technology developed to realize compression coding of moving images, for example, compression methods such as MPEG-1 / 2 / 4 standardized by ISO (International Organization for Standardization) are known. [0003] In each of these compression methods, it is possible to divide the input image data into a plurality of blocks, select intra-picture coding (coding mode ...

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Problems solved by technology

[0022] For example, in the prediction mode determination method of Patent Document 1, when the image size of the input image data is encoded at a low target bit rate, since the prediction mode is always limited, in such a picture requiring motion compensation accuracy, In the input image data with high correlation between them, the best prediction mode cannot be selected

[0023] In addition, in real-time processing, it is impossible to hold in advance a table of encoding amounts for each element of the prediction error image data and the motion vector as described in Patent Document 2.

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